Viscosity of lead melt
Thread Content
Please advise on the viscosity of lead melt at around 400°C
I asked a few engineers today, and they said that a viscosity value of 2.65 can be used; I hope everyone will participate in the discussion
On page 37 of Lead and Zinc Metallurgy, the viscosity of lead at 327°C is 2.65 mN•s/m2; on page 3 of Lead Metallurgy, the viscosity of lead at 340°C is 0.0189 Pa•s, which is equivalent to 18.9 mN•s/m2. It can be seen that there is a significant difference between these values. The viscosity of water at 20°C is 1.02 mN•s/m2, and it seems that the fluidity of lead at 400°C is similar to that of water; therefore, I believe that the dynamic viscosity of lead at 400°C should be between 1–2 mN•s/m2.
Thank you, but specific values still require theoretical support; the melting point of lead is 327°C, while the boiling point varies considerably, with 1525°C being the value generally accepted. So it’s still unknown how to determine the value for this viscosity. I’ve asked the technicians at the factory to test it for me when they have time; I’m not sure if it will be difficult
I would like to ask why the viscosity increases at 340°C Is it related to the oxides of lead in the solution?
It’s definitely not the case that higher temperature means higher viscosity! I think the data on lead metallurgy is incorrect; there’s a factor of ten error.
The viscosity of lead metallurgy at 340° is 0.0189 poise, while that of lead-zinc metallurgy is 2.65 mPa·s. Since 1 cP equals 1 mPa·s, the value for lead metallurgy is correct: its viscosity at 340° is 1.89 cP, which is equivalent to 1.89 mPa·s. There isn’t that much difference.